Question

give the coordinates of the image of a triangle ABC after reflection about the y-axis A(-1,5), B(-4,4), C(-3,1)

Answer 1

The coordinates of the triangle are:

$\begin{gathered} A\to(-1,5) \\ B\to(-4,4) \\ C\to(-3,1) \end{gathered}$

So if we made a reflection over the y axis we will cahnge the sign of the x coordinate so:

$\begin{gathered} A\to(-1,5)\to(1,5) \\ B\to(-4,4)\to(4,4) \\ C\to(-3,1)\to(3,1) \end{gathered}$